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Originally Posted by kerry
I have no clue. How can it pass from bird to human but then not from human to human? What has to happen for a virus that passes from one species to humans but not between humans, to become a virus that passes from human to human? I know it can happen when a pig gets a bird virus and the two together mutate into a third virus that can pass from swine to human and then human to human. But what happens in the virus that permits this to happen?
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I'm not a doctor, I just play one on T.V. but just a guess here. Since we use alot of pig pieces (skin, heart valves) in humans the two have to have some sort of similarity for a virus to replicate between the two. From human to human if the immune system is weakened enough then anything is possible it's like an open door.